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Aerobic capacity, the amount of oxygen your muscles can use per minute, is commonly tracked to determine an endurance athlete’s potential. Runners, swimmers, cyclists and others incorporate aerobic capacity training goals because it is often used as an indicator of fitness.

But, not considering mental toughness, the best indicator of success in endurance events isn’t just how well your muscles can get the needed oxygen from your blood but it is also how high a percent of it you can sustain over a long period of time.